Set log config for Kafka Binder

- set ZKClient logging level to `ERROR`
  - set the config implementations of `AbstractConfig` to `ERROR` logging level

This resolves #56
This resolves #52

Remove producer/consumer logging config
- Update copyright year

spring-cloud-stream-binder-kafka/src/main/java/org/springframework/cloud/stream/binder/kafka/KafkaBinderEnvironmentPostProcessor.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2017 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.stream.binder.kafka;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.env.EnvironmentPostProcessor;
+import org.springframework.core.env.ConfigurableEnvironment;
+import org.springframework.core.env.MapPropertySource;
+
+/**
+ * An {@link EnvironmentPostProcessor} that sets some common configuration properties (log config etc.,) for Kafka
+ *  binder.
+ *
+ * @author Ilayaperumal Gopinathan
+ */
+public class KafkaBinderEnvironmentPostProcessor implements EnvironmentPostProcessor {
+
+	@Override
+	public void postProcessEnvironment(ConfigurableEnvironment environment, SpringApplication application) {
+		Map<String, Object> propertiesToAdd = new HashMap<>();
+		propertiesToAdd.put("logging.pattern.console", "%d{ISO8601} %5p %t %c{2}:%L - %m%n");
+		propertiesToAdd.put("logging.level.org.I0Itec.zkclient", "ERROR");
+		propertiesToAdd.put("logging.level.kafka.server.KafkaConfig", "ERROR");
+		propertiesToAdd.put("logging.level.kafka.admin.AdminClient.AdminConfig", "ERROR");
+		environment.getPropertySources().addLast(new MapPropertySource("kafkaBinderLogConfig", propertiesToAdd));
+	}
+}

spring-cloud-stream-binder-kafka/src/main/resources/META-INF/spring.factories

@@ -0,0 +1,2 @@
+org.springframework.boot.env.EnvironmentPostProcessor=\
+  org.springframework.cloud.stream.binder.kafka.KafkaBinderEnvironmentPostProcessor